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Jefferson Lab Presentation to Teacher Education Program November 8, 2006 PowerPoint PPT Presentation


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Jefferson Lab Presentation to Teacher Education Program November 8, 2006. Subatomic Particles: What do we study at Jefferson Lab? Dr. Allison Lung 12 GeV Upgrade Project Director & Senior Staff Physicist. nucleons. Nuclear Physics: All About Atoms. education.jlab.org/atomtour.

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Jefferson Lab Presentation to Teacher Education Program November 8, 2006

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Jefferson lab presentation to teacher education program november 8 2006 l.jpg

Jefferson LabPresentation to Teacher Education ProgramNovember 8, 2006

Subatomic Particles:

What do we study at Jefferson Lab?

Dr. Allison Lung

12 GeV Upgrade Project Director

&

Senior Staff Physicist


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nucleons

Nuclear Physics: All About Atoms

education.jlab.org/atomtour


Building atoms l.jpg

Building atoms……


The tiniest particles or are they l.jpg

The tiniest particles……or are they?


Just how big are they what about all that empty space l.jpg

Just how big are they? What about all that empty space?


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Even tinier particles!


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Fundamental Particles

electric

charge

increasingmass

2/3

-1/3

0

-1

All visible matter in universe is made of Generation I particles.


Held together by a powerful force strong force l.jpg

Held together by a powerful force:STRONG FORCE


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Four Fundamental Forces

fundamental particles interact by responding to a force from another particle


And still more empty space filled with force fields l.jpg

And still more empty space…. filled with force fields

Atoms are 99.999999999999% empty space !!


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World of Atoms – a little background education

Atom: nucleus of neutrons & protons with orbiting electrons

go down one layer

Electron: very light particle with negative charge

Proton: weight equals ~2000 electrons, positive charge

Neutron: weight almost equal to proton, no net charge

go down one layer

Quarks: fundamental particles, 6 types,

up/down/strange are the lightest and most common

Forces: strong, electromagnetic, weak, gravity;

strong force holds quarks together

go down one layer ???

is there another layer ???


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Structureof Matter


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World of Atoms – a little background education

we are more “empty space” than matter,

“empty space” is filled with carefully balanced forces,

get students to expand on the solar system model of atoms

great Web pages for students:

http://www.particleadventure.org

http://education.jlab.org

http://www2.slac.stanford.edu/vvc

great Web pages for teachers:

http://www.colorado.edu/physics/2000

http://www.fnal.gov/pub/education/k-12_programs.html

http://csee.lbl.gov

http://www.nsta.org


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What really cool, tiny stuff do we study?

What forces hold the neutrons and protons together in an atom?

What forces hold the quarks inside a proton together?

How is electric charge distributed within a neutron or proton?

How is magnetic field distributed within a neutron or proton?

Does a “free” quark behave the same as a quark bound inside a proton?

Does a “free” quark behave the same as a quark bound inside a heavy atom?


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Jefferson Lab’s Scientific Purpose

Study how quarks and gluons combine to form

protons and neutrons

Study how protons, neutrons, and electrons combine to form atoms


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Jefferson Lab Lay-out

  • Dept. of Energy Laboratory

  • ~700 employees

  • >2000 scientists from 18 countries

accelerator schematic

aerial photo

  • 7/8 mile racetrack

  • superconducting

  • 3 experimental Halls

  • 6 billion electron volts


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South Linac Cryomodules


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Recirculation Arc Configuration

  • Arc 10


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Hall C


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Detector Systemsstudy strange quarks in proton (G-zero)

~ $10 Million cost

~ 5 year construction

~ 5 year measurements

~ 50 ton weight

~ 20 feet height

proton detectors

superconducting magnet

electron beam

hydrogen target


What are we studying right now l.jpg

What are we studying right now ?

How do strange quarks contribute

to the properties of the proton?

Do they contribute to the spin?

Are the strange quark’s electric

interactions different from their

magnetic interactions?


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Pentaquark – 5 quark combinations may exist?

What have we learned lately ?

proton can take many shapes……

quark’s spin doesn’t match neutron’s spin


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Upgrade magnets and power supplies

CHL-2

12

6 GeV CEBAF

11

Two 0.6 GV linacs

1.1

New cryomodules get new rf zones

FUTURE JEFFERSON LAB


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GlueX / Hall D Detector

Lead Glass

Detector

Barrel

Calorimeter

Solenoid

Coherent Bremsstrahlung

Photon Beam

Time of

Flight

Note that tagger is

80 m upstream of

detector

Tracking

Cerenkov

Counter

Target

Electron Beam from CEBAF


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Architect’s rendering of Hall D complex

Hall D

Counting House

Cryo Plant

Service Buildings


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SUMMARY

Jefferson Lab:

  • studies how protons and neutrons make up the nucleus of atoms

  • studies how quarks and gluons make up neutrons and protons

  • collides electrons with atomic targets and measures the energy, speed, and trajectory of scattered particles

    for your students

  • introduce the solar system model of the atom

  • go further...introduce forces (gravity, weak, electromagnetic, strong)

  • gee whiz factor!

    • we are more “empty space” than matter

    • there are incredible forces acting in that “empty space”

      physics is a great career !


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Nuclear Physics as a Career

  • college degree(s) required in physics, math, or computer science

  • possible career paths:

    • government laboratory scientist

    • university professor & researcher

    • computer firms

    • modeling economic trends on Wall Street

    • start-up technology companies (medical imaging, cryogenic helium…..)

  • salary range at Jefferson Lab (comparable to university professors):

    • Staff Scientist I (approx. $48,000 to $75,000)

    • Staff Scientist II (approx. $60,000 to $95,000)

    • Staff Scientist III (approx $75,000 to $120,000)


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